Booting Spammers Out of Your Mailing List

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I’ve noticed a trend lately: a lot of sign-ups to my mailing list from the same IP address. So I did a little research and lo-and-behold, it’s a “zombie” computer automatically signing up for ezines in order to steal the return address when you send the “thanks for signing up” autoresponder. (Those little stinkers!)

So, what do you do?

  • First, check to see if your ezine software captures the IP (internet protocol) address of people when they sign up.
  • Next, check for repeat IP addresses. I notice that these sign-ups are often in the “waiting for optin” list under, because they have no intention of opting-in.
  • Sometimes, however, there is an army of poorly paid people somewhere in the world who click on the opt-in links in emails for these spammers, so check your newly added email addresses¬†on your list. It’s easy to find them: look for email addresses that don’t match the name they signed up under. For instance, the name is “Mary Jones” but the email address says The email addresses are almost always from,,¬†or because these are free email services. Yahoo seems to be the frontrunner in bad/zombie email addresses.
  • When you find a suspicious email address, copy it into Google to see if sites like have blacklisted that email address.
  • Finally, I go back to my mailing system, and look for the place where I can block specific IP addresses or specific email addresses.

Voila! Now that zombie can’t sign up for my mailing list anymore!

It takes a little due diligence to keep your list clean, but it’s well worth it. And if your mailing list system won’t let you ban IP addresses, consider switching to a new one.

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Category: Internet & Social Media Marketing
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